var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
var session = require('express-session');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');

var index = require('./routes/index');
var signin = require('./routes/auth/signin');
var logout = require('./routes/auth/logout');
var signup= require('./routes/auth/signup');

var app = express();
// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'ejs');
app.set('view cache', false);

// uncomment after placing your favicon in /public
//app.use(favicon(path.join(__dirname, 'public', 'favicon.ico')));
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));
app.use(session({
  resave: true, // don't save session if unmodified
  saveUninitialized: false, // don't create session until something stored
  secret: 'love'
}));

function checkLogin (req, res, next) {
  if (req.session.username) {
    next();//检验到用户已登入，转移权限阁下一个路由
  } else {
    res.redirect('/login');//否则，页面重定位，不执行下面路由
  }
}
app.all('*', function(req, res, next) {
    res.header("Access-Control-Allow-Origin", "*");
    res.header('Access-Control-Allow-Methods', 'PUT, GET, POST, DELETE, OPTIONS');
    res.header("Access-Control-Allow-Headers", "X-Requested-With");
    res.header('Access-Control-Allow-Headers', 'Content-Type');
    next();
});
app.use('/signin/*',checkLogin)

app.use('/', index);
app.use('/signin', signin);
app.use('/signup', signup);
app.use('/logout', logout);

// app.use('/users', users);

// catch 404 and forward to error handler
app.use(function(req, res, next) {
  var err = new Error('Not Found');
  err.status = 404;
  next(err);
});

// error handler
app.use(function(err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render('error');
});

module.exports = app;
